:root {
    /* Color Tokens: Brutalist Academic / Blueprint */
    --c-ink: #0A0A0C;
    --c-paper: #F4F4F0;
    --c-accent: #D32F2F; /* Crimson Red */
    --c-slate: #4A5568;
    --c-border: #111111;
    --c-surface: #FFFFFF;

    /* Typography Tokens */
    --font-display: 'Lora', serif;
    --font-body: 'Public Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;

    --radius: 0; /* Brutalist: no rounded corners */
}

@font-face {
    font-family: 'Lora';
    src: url('/assets/fonts/Lora-Regular.woff2') format('woff2');
    font-weight: 400 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Public Sans';
    src: url('/assets/fonts/PublicSans-Regular.woff2') format('woff2');
    font-weight: 400 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Mono';
    src: url('/assets/fonts/IBMPlexMono-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background-color: var(--c-paper);
    color: var(--c-ink);
    font-family: var(--font-body);
    line-height: 1.6;
    font-size: 16px;
    scroll-behavior: smooth;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.1;
    margin-top: 0;
    margin-bottom: var(--space-sm);
    color: var(--c-ink);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); border-bottom: 2px solid var(--c-ink); padding-bottom: 0.25rem;}
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; font-family: var(--font-body); font-weight: 700; }

p { margin-top: 0; margin-bottom: var(--space-sm); }
a { color: var(--c-accent); text-decoration: underline; text-underline-offset: 3px; font-weight: 500; }
a:hover { color: var(--c-ink); }

strong { font-weight: 700; }
em { font-style: italic; }

code, kbd, samp, pre {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--c-ink);
    color: var(--c-paper);
    padding: 0.2em 0.4em;
}
pre { padding: var(--space-sm); overflow-x: auto; }
pre code { background: none; padding: 0; }

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--c-accent);
    color: var(--c-paper);
    padding: 8px;
    z-index: 100;
}
.skip-link:focus { top: 0; }

/* Header */
.site-header {
    border-bottom: 3px solid var(--c-ink);
    background: var(--c-paper);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--c-ink);
    text-decoration: none;
}
.site-logo svg {
    flex-shrink: 0;
}

.site-nav {
    display: flex;
    gap: var(--space-md);
}

.nav-link {
    color: var(--c-ink);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0;
}
.nav-link:hover { color: var(--c-accent); }
.nav-link.nav-active { border-bottom: 2px solid var(--c-accent); color: var(--c-accent); }

/* Main Content */
.page-content {
    min-height: 80vh;
}

/* Footer */
.site-footer {
    border-top: 4px solid var(--c-ink);
    background-color: var(--c-ink);
    color: var(--c-paper);
    padding: var(--space-lg) 0 var(--space-md);
    margin-top: var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
    margin-bottom: var(--space-sm);
}
.footer-desc {
    color: #A0AEC0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.link-col h4 {
    color: var(--c-paper);
    margin-bottom: var(--space-sm);
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
}

.link-col a {
    display: block;
    color: #A0AEC0;
    text-decoration: none;
    margin-bottom: var(--space-xs);
}
.link-col a:hover { color: var(--c-accent); text-decoration: underline; }

.footer-bottom {
    border-top: 1px solid #2D3748;
    padding-top: var(--space-md);
    font-size: 0.85rem;
    color: #A0AEC0;
    text-align: center;
}

/* Forms & Tools */
.tool-container {
    background: var(--c-surface);
    border: 2px solid var(--c-ink);
    padding: var(--space-md);
    margin: var(--space-md) 0;
    box-shadow: 6px 6px 0 var(--c-ink);
}

.form-group { margin-bottom: var(--space-sm); }
label { display: block; font-weight: 700; margin-bottom: 0.25rem; font-family: var(--font-mono); font-size: 0.9rem; }
input[type="number"], input[type="text"], select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--c-ink);
    background: var(--c-paper);
    font-family: var(--font-mono);
    font-size: 1rem;
}
input:focus, select:focus { outline: 2px solid var(--c-accent); outline-offset: 2px; }

.btn {
    display: inline-block;
    background: var(--c-ink);
    color: var(--c-paper);
    border: 2px solid var(--c-ink);
    padding: 0.75rem 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover { background: var(--c-accent); border-color: var(--c-accent); color: var(--c-paper); }

.tool-result {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--c-ink);
    color: var(--c-paper);
    border-left: 4px solid var(--c-accent);
}
.tool-result h4 { color: var(--c-paper); margin-bottom: var(--space-xs); }
.tool-result p { margin: 0; font-family: var(--font-mono); font-size: 1.25rem; }

.noscript-msg {
    background: #FFF3CD;
    color: #856404;
    padding: var(--space-sm);
    border-left: 4px solid #FFEEBA;
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
}

/* Grids and Utilities */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-sm); }

/* Responsive */
@media (max-width: 768px) {
    .site-nav { display: none; /* In a real app we'd add a burger menu, for now just links in footer and simplified top */ }
    .site-header { position: static; }
    .footer-grid { grid-template-columns: 1fr; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

@media (max-width: 1024px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
}